JPS59184618A - Manufacture of fiber reinforced cylindrical plastics - Google Patents

Abstract

PURPOSE:To obtain fiber reinforced cylindrical plastics under favorable productivity, by a method wherein a right circular cylindrical laminated body obtained by laminating cloth or preimpregnated cloth is fitted in a female metal mold so as to possess an orientation angle of the fiber to the circumferential direction, which is welded and allotted to the mold through a high pressure fluid in a bag in the inside of the cylindrical laminated body. CONSTITUTION:At the time of manufacture of fiber reinforced cylindrical plastics whose outer diameter is varying in order, a right circular cylindrical laminated body 5 obtained by laminating cloth or preimpregnated cloth is fitted in a female metal mold 6 for the cylinder so as to possess the outside diameter which is either identical with or smaller than the smallest outside diameter of said cylinder and an orientation angle of the fiber to the circumferential direction, a bag 7 having elasticity is loaded on the inside of the righr circular cylindrical laminated body 5 further, a high pressure fluid is made to flow in the bag 7, the right circular cylindrical laminated body 5 is welded and allotted to the female metal mold 6 by pressure, and the cylindrical plastics is molded. The fiber reinforced cylindrical plastics having less dispersion in performance of products is obtained under favorable productivity in this manner.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention is lightweight and has excellent strength and productivity.

The present invention relates to a method of manufacturing fiber-reinforced cylindrical plastic whose outer diameter changes sequentially.

[Background technology]

There is a desire for a structure that is lightweight and has high strength and has a cylindrical shape in which the outer diameter changes sequentially, and a typical example is a wheel for a traffic vehicle. The present invention will be explained below using a disc wheel for an automobile as an example.

Disc wheels made of fiber-reinforced plastic materials have attracted attention due to their light weight (1) and high strength, and the development of their technology has become active. The disc wheel made of plastic material is a three-piece type wheel or a split type wheel that combines a rim and an outer rim.The manufacturing method is as follows: a unidirectionally aligned prepreg sheet impregnated with matrix resin. Alternatively, when winding reinforcing fibers in the form of flat and circular mat-like cloths into a mold for forming a prepreg rim portion impregnated with matrix resin, the prepreg (1) is placed in the mold as shown in Figure 1. A cut (2) is provided at one end, and the stack is formed by overlapping the cuts to form a rim shape. Methods such as (4) combining have been used.

As a result, the molding process is complicated, and the performance of the resulting disc wheel products varies widely.

[Structure of the invention]

The present inventors conducted repeated studies with the aim of obtaining a disk wheel made of fiber-reinforced cylindrical plastic with good productivity and a variable outer diameter that would avoid variations in product performance.As a result, the present invention was developed. It has been reached.

The gist of the present invention is to produce a fiber-reinforced cylindrical plastic whose outer diameter changes sequentially, which has an outer diameter that is the same as or smaller than the minimum outer diameter of the cylinder, and which has fiber orientation in the circumferential direction. A right cylindrical product made of laminated cloth or cloth prepreg so as to have corners, and a carcass are fitted into the female mold for the cylinder.

Furthermore, a stretchable bag is loaded inside the right cylindrical laminate, high-pressure fluid is allowed to flow into the bag, and the right cylindrical laminate is pressed into a female mold and molded. It is a feature.

The cloth or cloth prepreg that has a fiber orientation angle with respect to one circumferential direction used in carrying out the present invention is one in which the constituent fibers of the cloth or cloth prepreg have an orientation angle that is diagonal to the circumferential direction of the cylinder.

The orientation angle in this case refers to the angle formed by the cloth or cloth prepreg constituent yarns with respect to the circumferential direction of the cylinder.

A cross with orientation angles is shown in FIG. The direction of the arrow is the circumferential direction. The orientation angle in this case is 45°, and such orientation can be obtained by using a fabric with the same density as the warp and weave, but it is also possible to cut this outer sudare weave at an arbitrary angle.
A desired orientation angle can be obtained.

A cross with an orientation angle is a rectangular cross 4 as shown in Figure 5.
By pulling the two corners in the direction of the arrow, it can be deformed without causing wrinkles as shown in Figure 9. Taking advantage of this characteristic, it is possible to shape objects with complex curved surfaces, such as the rim of a two-piece disc wheel with an integrated wheel rim shown in Figure 3, into a target shape by applying external pressure and tension. OJ ability is to mold according to the mold. As the distribution angle decreases, the warp and weft yarns constituting the cloth or cloth prepreg become more along the circumferential direction of the cylinder, improving the strength in the two circumferential directions. Therefore, when using cloth or cloth prepreg with an orientation angle, once the target diameter, strength, rigidity, etc. are determined, the orientation angle, warp configuration, density, and cutting method of the laminated pattern should be considered, and the cloth or cloth prepreg should be Select the laminated configuration
It is possible to f.

The reinforcing fiber used in making the cloth or cloth prepreg is glass fiber.

One or two types of heat-resistant and high-strength fibers such as carbon fiber, silicon carbide fiber, alumina fiber, aramid fiber, etc.
More than one species can be used together.

Depending on the purpose, metal fibers with good thermal conductivity can also be used in combination.

Next, a method for manufacturing a disk wheel, which is one of the fiber-reinforced cylindrical plastics of the present invention, will be explained in more detail with reference to FIG.

First, the strength required by the disc wheel.

Considering rigidity, select the orientation angle of the cross in the wheel circumferential direction, the laminated structure, etc., and then make the rim portion forming cylinder so that the minimum diameter of the female mold (6) matches the outer diameter of the right cylindrical laminated body (51). The right cylindrical laminate is created. This is fitted inside the rim portion forming cylinder female mold (6) as shown by the arrow. Furthermore, elasticity is applied to the inside of the right cylindrical laminate (5). Bag with (
7) Load. -Female mold for the cylinder that then forms the rim (6
) with the lid (9). At this time, the high pressure fluid inlet (8) attached to the bag (71) is passed through the insertion hole (10) provided in the lid (9). After that, the high pressure fluid is introduced into the bag (7). Depending on the bag (7
) expands.

The right cylindrical laminate (5) can be pressed and shaped without causing wrinkles on the inner surface of the female mold (6) for forming the rim portion. When performing curing molding in this state, this can be done by creating a right cylindrical laminate (5) from cross prepreg and heating it to the curing temperature. There are several methods that can be considered to carry out this fine sand formation, but the present invention is not limited to these methods. For example, a cloth prepreg impregnated with matrix resin and pressed and molded using a bag (7) is taken out from a female mold (6) for forming a rim part, and then molded in a normal autoclave or molded in a male mold. It is also possible to separately prepare a mold and use it for press molding. Furthermore, the cloth that has not been impregnated with the matrix resin is shaped using the bag (7), and then taken out while still attached to the rim part forming cylinder mold 16+, and a male mold is inserted inside this. It is also possible to harden and mold the matrix resin by press-fitting it into the cross laminate (5) and heating it.

The high-pressure fluid used in the present invention may be either gas or liquid, but air is most preferred in terms of cost and ease of handling.

〔Example〕

The present invention will be explained below based on specific examples.

Example 1 A right cylindrical laminate (5) as shown in Fig. 6 was prepared at ℃.

A carbon fiber satin weave cloth (wetness: 400 J'/m") was impregnated with epoxy resin as a matrix resin so that it had a volume of 40% compared to carbon fiber. A material was used which was laminated so that the angular force was 45°.The number of laminated sheets was 15 for each cross section.This was fitted inside a female mold (6) for forming a rim portion cylinder.

Furthermore, inside it is a silicone rubber cylindrical rubber bag (7
), place lids (9) on the top and bottom of the mold, then put them into a curing furnace and put them in a rubber bag (7) at 4 kf/c.
At the same time as compressed air of r/L' is introduced, the viscosity of the matrix resin is once lowered to form a prepreg laminate (5;
In order to press and form the mold, the mold temperature was set to 40℃1. After holding for 60 minutes, the temperature was raised to 18°C for curing. After 60 minutes, the mold was taken out of the curing furnace, slowly cooled, and then demolded.

The rim portion of the obtained disc wheel was fastened to a carbon fiber reinforced plastic disc prepared separately using titanium bolts to produce a disc wheel. The total weight of the disc wheel thus produced was 4.5 kp. Furthermore, a tube and tire are installed, and 6 kt is placed inside the tube.
A strength test was conducted by injecting a hydrostatic pressure of /crrL'', and no problems were found.

Example 2 A right cylindrical cross laminate (5) as shown in FIG.
Carbon fiber satin cloth (Weight: 400P/ln')
The orientation angle of the depressed part in the center of the rim is 45°.
A layered structure was used so that the structure was as follows.

The number of M layers was 15 for each cross section. This is fitted inside a female mold for forming a rim part (6), and a cylindrical bag (7) made of natural rubber is loaded inside it, and the upper and lower surfaces of the female mold for a cylinder (6) are fitted. Place the lid (9) on the

Thereafter, compressed air of 1 kf/cm" was flowed into the rubber bag (7) to form the rim. With the cloth laminate (5) attached, the rim forming mold (6) was taken out and the inside of the rubber bag (7) was pressed. Insert the male mold from above and below, inject unsaturated polyester resin at a pressure of 3 k#/Cfn' through the matrix resin injection hole provided in the upper part of the male mold, and bring the mold temperature to 14
Curing was performed at 0° C. for 30 minutes, followed by slow cooling and demolding.

The obtained disc wheel was connected to a carbon fiber-reinforced plastic disc prepared separately using titanium bolts to produce a disc wheel.

The total weight of this disc wheel was 4.5 ky. Similar to Example 1, there were no problems in the strength test using hydrostatic pressure of 6 kf/crrL2.

According to the present invention, the work of laminating reinforcing fibers for automobile disc wheels, which conventionally took a long time and was carried out by hand, can be carried out extremely easily.Moreover, the rim part can be manufactured in one piece, and additional pressure cuts can be made. Since the continuous reinforcing fibers are sufficiently oriented throughout the rim, it has been possible to successfully obtain a disc wheel having a rim that is excellent in terms of strength and rigidity. The disc wheel is just one example of the fiber-reinforced cylindrical plastic whose outer diameter is gradually improved according to the present invention, but it can also be applied not only to automobiles but also to disc wheels for automobiles, automobiles, bicycles, etc., and parts for general industrial use. can.

While the weight of currently commonly used cast aluminum disc wheels is approximately 7.4 kp (7 wheels), the weight of the disc wheels obtained with the present invention has been reduced by approximately 35 parts. This saves fuel.

It can be expected to have a wide range of effects, including improved ride comfort and suspension durability.

[Brief explanation of the drawing]

Fig. 1 is a state diagram when manufacturing a conventional split-type disc wheel, Fig. 2 is a sectional view of a three-piece disc wheel, Fig. 3 is a partial sectional view of a disc wheel that is an example of the present invention, and Fig. 3 is a partial sectional view of a disc wheel that is an example of the present invention. Figure 4.5 is a plan view of a cloth having a fiber orientation angle with respect to the circumferential direction used to create the fiber-reinforced cylindrical plastic of the present invention, and Figure 6 is a plan view of the rim portion of a disc wheel that is an example of the present invention. Each figure shows a schematic diagram showing the process of creating the . -+1 Kuni threat 2 figure + 3 figure

Claims (1)

[Claims] In the production of fiber-reinforced cylindrical plastics whose outer diameter changes sequentially, cloth or cross prepreg is used so that the outer diameter is the same as or smaller than the minimum outer diameter of the cylinder and the fiber orientation angle is in the circumferential direction. A right cylindrical laminate in which the right cylindrical laminate is laminated is fitted into the cylindrical female mold, a stretchable bag is loaded inside the right cylindrical laminate, and high pressure fluid is allowed to flow into the bag, A method for manufacturing a fiber-reinforced cylindrical plastic whose outer diameter sequentially changes, characterized by press-molding the right cylindrical laminate in a female mold.